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Signal transmitter linearization

  • US 8,498,590 B1
  • Filed: 03/30/2007
  • Issued: 07/30/2013
  • Est. Priority Date: 04/04/2006
  • Status: Active Grant
First Claim
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1. A linearizer for a non-linear transmitter, the linearizer comprising:

  • a feedback receiver;

    a gain regulator continuously adapted to be coupled to a non-linear transmitter;

    an adaptive loop gain controller coupled to the gain regulator;

    a loop gain bounding controller that receives feedback from a non-linear transmitter output and is coupled to control the gain regulator;

    a continuously adaptive predistorter to apply complex-number amplification to provide a predistortion signal using continuously adapted predistortion values as a function of the feedback for the non-linear transmitter;

    an adaptive predistorter controller to estimate the nonlinearity present in the adaptive loop and control the predistorter; and

    a predistortion bounding controller coupled to receive signals from the non-linear transmitter and separately coupled to receive signals from the feedback receiver to prevent unstable transmitter operation by providing predistortion control signals to provide limits on the predistorter and providing adaption control signals to the adaptive predistorter controller to modify updating of the predistortion values, wherein at least one of the signals from the non-linear transmitter or the signals from the feedback receiver comprise a flag indicating saturation or overflow of an input to the non-linear transmitter or the feedback receiver, respectively.

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